WanManito / mxflow.io

https://wanmanito.github.io/mxflow.io/#/mxflow

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基于mxgraph.js开发的流程图组件

1.fabric.js 在决定使用mxgraph.js开发流程图之前,尝试过用fabric.js来开发,结果发现并没有想象中的那么简单,而且用户体验非常差,下面是体验地址: https://wanmanito.github.io/mxflow.io/#/workflow,直到遇到一个致命bug,当我准备加一个双击图形输入文字功能,花了 一点时间捣鼓了一下,通过group组合实现了此功能,但是,第一次双击输入正常,第二次再次双击就出现莫名其妙的情况,最后反馈给作者说下个版本 不准备解决,看了下issues,也发现了类似的问题,此方案就此放弃。

2.GoJs 第二次有人推荐我使用GoJs,看了下功能确实强大,也找到了符合我想要的流程图应用,但是。。。。尝试运行简单的例子同步到Vue,没出什么问题,当同步 一个简单的流程图示例,各种问题,捣鼓了很久还是没能运行成功,最重要的它的api写法简直太难受,此方案也就此放弃。官方示例: https://gojs.net/latest/samples/draggableLink.html

3.mxgraph.js

先上图来一波

体验地址: https://wanmanito.github.io/mxflow.io/#/mxflow 说一下基础api的使用以及一些坑

1.定义全局Cell样式

this.style = new Object();
this.style[mxConstants.STYLE_DASHED] = 0;//0实线 1虚线
this.style[mxConstants.STYLE_STROKEWIDTH] = 1;//边框宽度
// this.style[mxConstants.STYLE_GRADIENTCOLOR] = 'red';//渐变色
this.style[mxConstants.STYLE_GRADIENT_DIRECTION] = mxConstants.DIRECTION_WEST;//渐变方向  east-东 west-西 north-北 south-南
this.style[mxConstants.STYLE_FONTFAMILY] = "consolas";//字体
this.style[mxConstants.STYLE_FONTSTYLE] = 0;//1-加粗 2-斜体 4-下划线
this.style[mxConstants.STYLE_HORIZONTAL] = 1;//1-水平 0-垂直
this.style[mxConstants.STYLE_LABEL_POSITION] = "center";//文字居中 结合下面属性控制
this.style[mxConstants.STYLE_VERTICAL_LABEL_POSITION] = "middle";//
this.graph.getStylesheet().putDefaultVertexStyle(this.style);//put到全局style中

2.定义全局Edge、label样式

this.style = this.graph.getStylesheet().getDefaultEdgeStyle();     
this.style['fontSize'] = this.fontSize;
this.style['verticalAlign'] = 'bottom';
this.style[mxConstants.STYLE_ROUNDED] = true;
this.style[mxConstants.STYLE_EDGE] = mxEdgeStyle.ElbowConnector;
this.style[mxConstants.STYLE_LABEL_BACKGROUNDCOLOR] = "white";//transparent 连线文字背景颜色
this.style[mxConstants.STYLE_ORTHOGONAL_LOOP] = 1;
this.style[mxConstants.STYLE_JETTY_SIZE] = "auto";  

3.局部样式

let style = new Object();
style[mxConstants.STYLE_SHAPE] = mxConstants.SHAPE_IMAGE;
style[mxConstants.STYLE_PERIMETER] = mxPerimeter.RectanglePerimeter;
style[mxConstants.STYLE_IMAGE] = '../../../static/img/star_200.png';
style[mxConstants.STYLE_FONTCOLOR] = 'black';
this.graph.getStylesheet().putCellStyle('image', style);//自定义背景style
this.graph.insertVertex(this.parent, null, 'star', x, y, 100, 100, 'image');//使用方式

4.修改全局Cell默认样式 Edge同理

let style = this.graph.getStylesheet().getDefaultVertexStyle();
style[mxConstants.STYLE_FONTCOLOR] = this.color;

5.设置单个或者多个Cell样式 Edge同理

 this.graph.setCellStyles(mxConstants.STYLE_GRADIENT_DIRECTION, this.curDirGradient);//第一种方式
 this.graph.setCellStyles(mxConstants.STYLE_FILLCOLOR, "none", [vertex]);//第二种方式

6.复制

let selectionCells = this.graph.getSelectionCells();
mxClipboard.copy(this.graph, selectionCells);

7.粘贴

mxClipboard.paste(this.graph);

8.剪切

let selectionCells = this.graph.getSelectionCells();
mxClipboard.cut(this.graph, selectionCells);

9.放大

this.graph.zoomIn();

10.缩小

this.graph.zoomOut();

11.撤销与还原

初始化:
this.undoMng = new mxUndoManager();
let listener = (sender, evt) => {
    this.undoMng.undoableEditHappened(evt.getProperty('edit'));
              };
 this.graph.getModel().addListener(mxEvent.UNDO, listener);
 his.graph.getView().addListener(mxEvent.UNDO, listener);
 撤销:
 this.undoMng.undo();
 还原:
 this.undoMng.redo();

12.组合

let vertex = new mxCell(null, new mxGeometry(0, 0));
vertex.setVertex(true);
this.graph.groupCells(vertex, 0, this.graph.getSelectionCells());

13.分解

this.graph.ungroupCells(this.graph.getSelectionCells());

14.加载xml自定义图形

try {
     let req = mxUtils.load(this.staticPath+'xml/basic.xml');//此处路径写成项目资源文件目录
     let root = req.getDocumentElement();
     let shape = root.firstChild;
     while (shape != null) {
     if (shape.nodeType == mxConstants.NODETYPE_ELEMENT) {
        let name = shape.getAttribute('name');
        this.basicItems.push(name);//存储读取的shape名称数组
        mxStencilRegistry.addStencil(name, new mxStencil(shape));
        }
         shape = shape.nextSibling;
                }
      } catch (e) {
          mxUtils.alert('Cannot load' + e);
        }
使用方式:
let basic = document.getElementById("basic");
this.basicItems.forEach((name, index) => {
                    basic.append(this.createItem("", 45, 45, "shape=" + name));
                });
createItem方法:
createItem(title, width, height, style) {
   let vertex = new mxCell(null, new mxGeometry(0, 0, width, height), style);
   vertex.setVertex(true);
   let elt = document.createElement('div');
   elt.className = 'el-col el-col-8  basic';
   // elt.style.overflow = 'hidden';
   // Blocks default click action
   // mxEvent.addListener(elt, 'click', function(evt)
   // {
   //     mxEvent.consume(evt);
   // });
   // this.graph.view.scaleAndTranslate(1, 0, 0);
   this.graph.setCellStyles(mxConstants.STYLE_FILLCOLOR, "none", [vertex]);
   this.graph.setCellStyles(mxConstants.STYLE_STROKEWIDTH, 3, [vertex]);
   this.graph.setCellStyles(mxConstants.STYLE_STROKECOLOR, "#515151", [vertex]);
   this.graph.setCellStyles(mxConstants.STYLE_SHADOW, false, [vertex]);
   this.graph.setCellStyles(mxConstants.STYLE_ALIGN, mxConstants.ALIGN_CENTER, [vertex]);
   this.graph.setCellStyles(mxConstants.STYLE_IMAGE_WIDTH, 48, [vertex]);
   this.graph.setCellStyles(mxConstants.STYLE_IMAGE_HEIGHT, 48, [vertex]);
   this.graph.addCell(vertex);
   let node;
   node = this.graph.view.getCanvas().ownerSVGElement.cloneNode(true);
   this.graph.getModel().clear();
   elt.appendChild(node);
   return elt;
    },//创建自定义html包裹的svg

15.一些坑

有些全局样式也可以直接修改,(不用像上面那样put)例如:
mxConstants.VERTEX_SELECTION_COLOR = "#29B6F2";

鼠标框选 不显示背景颜色
new mxRubberband(this.graph);
解决办法添加以下css
div.mxRubberband {
      position: absolute;
      overflow: hidden;
      border-style: solid;
      border-width: 1px;
      border-color: #0000FF;
      background: #3481D7;
    }
    
加载xml自定义图形上面14点已完整说明。

暂时就介绍那么多,还有很多细节设置就下次再说了。

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https://wanmanito.github.io/mxflow.io/#/mxflow


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